a serious chronic ailment
It's hard to get up in the cold. Chinese idiom, Pinyin is ch é NK ē n á NQ ǐ, which means that you can't get out of bed because you have been seriously ill for a long time.
A note to the idiom "deep sickness": serious illness or old illness.
a serious chronic ailment
one 's word does not express his idea - cí bù dá yì